Commercial HVAC systems Flashcards

1
Q

In commercial hvac systems, there are two types of HVAC systems

A

Constant air volume (CAV)
Variable air volume (VAV)

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2
Q

In a simple constant air volume system, the supply air flow rate is (…)?

A

Is constant, but the supply air temperature is varied to meet the thermal loads of a space.

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3
Q

What does most CAV systems serve

A

Small and serve a single thermal zone.

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4
Q

What does CAV stands for

A

Constant Air Volume

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5
Q

The two types of CAV systems that are commonly used to modify the supply air temperature?

A

The terminal reheat system
The mixed air system

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6
Q

Disadvantage of terminal reheat system.

A

Waste energy

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7
Q

Mixed air volume system.

A

Has two air streams, one for the coldest and one for the hottest. The two air streams are strategically combined to offset the space load .

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8
Q

Hot and cold air never mixes in the three-deck system. (True or False)

A

True

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9
Q

What is the difference between a multi zone system and a three deck multi zone system ?

A

Unlike the multi zone system, a three deck multi zone system a neutral air stream that is neither cooled or heated. In this system the cool and hot air never mixes, eliminating energy waste !

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10
Q

Where does the air mixing occur in a dual duct system?

A

In the zone or close to the zone it is serving

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11
Q

Where does the air mixing occur in a multi zone system?

A

Mixing occurs in the air handling unit.

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